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ssh-keygen.c
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ssh-keygen.c
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/* $OpenBSD: ssh-keygen.c,v 1.471 2023/09/04 10:29:58 job Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
* Identity and host key generation and maintenance.
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
#include "includes.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#ifdef WITH_OPENSSL
#include <openssl/evp.h>
#include <openssl/pem.h>
#include "openbsd-compat/openssl-compat.h"
#endif
#ifdef HAVE_STDINT_H
# include <stdint.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#ifdef HAVE_PATHS_H
# include <paths.h>
#endif
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <locale.h>
#include <time.h>
#include "xmalloc.h"
#include "sshkey.h"
#include "authfile.h"
#include "sshbuf.h"
#include "pathnames.h"
#include "log.h"
#include "misc.h"
#include "match.h"
#include "hostfile.h"
#include "dns.h"
#include "ssh.h"
#include "ssh2.h"
#include "ssherr.h"
#include "ssh-pkcs11.h"
#include "atomicio.h"
#include "krl.h"
#include "digest.h"
#include "utf8.h"
#include "authfd.h"
#include "sshsig.h"
#include "ssh-sk.h"
#include "sk-api.h" /* XXX for SSH_SK_USER_PRESENCE_REQD; remove */
#include "cipher.h"
#define DEFAULT_KEY_TYPE_NAME "ed25519"
/*
* Default number of bits in the RSA, DSA and ECDSA keys. These value can be
* overridden on the command line.
*
* These values, with the exception of DSA, provide security equivalent to at
* least 128 bits of security according to NIST Special Publication 800-57:
* Recommendation for Key Management Part 1 rev 4 section 5.6.1.
* For DSA it (and FIPS-186-4 section 4.2) specifies that the only size for
* which a 160bit hash is acceptable is 1kbit, and since ssh-dss specifies only
* SHA1 we limit the DSA key size 1k bits.
*/
#define DEFAULT_BITS 3072
#define DEFAULT_BITS_DSA 1024
#define DEFAULT_BITS_ECDSA 256
static int quiet = 0;
/* Flag indicating that we just want to see the key fingerprint */
static int print_fingerprint = 0;
static int print_bubblebabble = 0;
/* Hash algorithm to use for fingerprints. */
static int fingerprint_hash = SSH_FP_HASH_DEFAULT;
/* The identity file name, given on the command line or entered by the user. */
static char identity_file[PATH_MAX];
static int have_identity = 0;
/* This is set to the passphrase if given on the command line. */
static char *identity_passphrase = NULL;
/* This is set to the new passphrase if given on the command line. */
static char *identity_new_passphrase = NULL;
/* Key type when certifying */
static u_int cert_key_type = SSH2_CERT_TYPE_USER;
/* "key ID" of signed key */
static char *cert_key_id = NULL;
/* Comma-separated list of principal names for certifying keys */
static char *cert_principals = NULL;
/* Validity period for certificates */
static u_int64_t cert_valid_from = 0;
static u_int64_t cert_valid_to = ~0ULL;
/* Certificate options */
#define CERTOPT_X_FWD (1)
#define CERTOPT_AGENT_FWD (1<<1)
#define CERTOPT_PORT_FWD (1<<2)
#define CERTOPT_PTY (1<<3)
#define CERTOPT_USER_RC (1<<4)
#define CERTOPT_NO_REQUIRE_USER_PRESENCE (1<<5)
#define CERTOPT_REQUIRE_VERIFY (1<<6)
#define CERTOPT_DEFAULT (CERTOPT_X_FWD|CERTOPT_AGENT_FWD| \
CERTOPT_PORT_FWD|CERTOPT_PTY|CERTOPT_USER_RC)
static u_int32_t certflags_flags = CERTOPT_DEFAULT;
static char *certflags_command = NULL;
static char *certflags_src_addr = NULL;
/* Arbitrary extensions specified by user */
struct cert_ext {
char *key;
char *val;
int crit;
};
static struct cert_ext *cert_ext;
static size_t ncert_ext;
/* Conversion to/from various formats */
enum {
FMT_RFC4716,
FMT_PKCS8,
FMT_PEM
} convert_format = FMT_RFC4716;
static char *key_type_name = NULL;
/* Load key from this PKCS#11 provider */
static char *pkcs11provider = NULL;
/* FIDO/U2F provider to use */
static char *sk_provider = NULL;
/* Format for writing private keys */
static int private_key_format = SSHKEY_PRIVATE_OPENSSH;
/* Cipher for new-format private keys */
static char *openssh_format_cipher = NULL;
/* Number of KDF rounds to derive new format keys. */
static int rounds = 0;
/* argv0 */
extern char *__progname;
static char hostname[NI_MAXHOST];
#ifdef WITH_OPENSSL
/* moduli.c */
int gen_candidates(FILE *, u_int32_t, u_int32_t, BIGNUM *);
int prime_test(FILE *, FILE *, u_int32_t, u_int32_t, char *, unsigned long,
unsigned long);
#endif
static void
type_bits_valid(int type, const char *name, u_int32_t *bitsp)
{
if (type == KEY_UNSPEC)
fatal("unknown key type %s", key_type_name);
if (*bitsp == 0) {
#ifdef WITH_OPENSSL
int nid;
switch(type) {
case KEY_DSA:
*bitsp = DEFAULT_BITS_DSA;
break;
case KEY_ECDSA:
if (name != NULL &&
(nid = sshkey_ecdsa_nid_from_name(name)) > 0)
*bitsp = sshkey_curve_nid_to_bits(nid);
if (*bitsp == 0)
*bitsp = DEFAULT_BITS_ECDSA;
break;
case KEY_RSA:
*bitsp = DEFAULT_BITS;
break;
}
#endif
}
#ifdef WITH_OPENSSL
switch (type) {
case KEY_DSA:
if (*bitsp != 1024)
fatal("Invalid DSA key length: must be 1024 bits");
break;
case KEY_RSA:
if (*bitsp < SSH_RSA_MINIMUM_MODULUS_SIZE)
fatal("Invalid RSA key length: minimum is %d bits",
SSH_RSA_MINIMUM_MODULUS_SIZE);
else if (*bitsp > OPENSSL_RSA_MAX_MODULUS_BITS)
fatal("Invalid RSA key length: maximum is %d bits",
OPENSSL_RSA_MAX_MODULUS_BITS);
break;
case KEY_ECDSA:
if (sshkey_ecdsa_bits_to_nid(*bitsp) == -1)
#ifdef OPENSSL_HAS_NISTP521
fatal("Invalid ECDSA key length: valid lengths are "
"256, 384 or 521 bits");
#else
fatal("Invalid ECDSA key length: valid lengths are "
"256 or 384 bits");
#endif
}
#endif
}
/*
* Checks whether a file exists and, if so, asks the user whether they wish
* to overwrite it.
* Returns nonzero if the file does not already exist or if the user agrees to
* overwrite, or zero otherwise.
*/
static int
confirm_overwrite(const char *filename)
{
char yesno[3];
struct stat st;
if (stat(filename, &st) != 0)
return 1;
printf("%s already exists.\n", filename);
printf("Overwrite (y/n)? ");
fflush(stdout);
if (fgets(yesno, sizeof(yesno), stdin) == NULL)
return 0;
if (yesno[0] != 'y' && yesno[0] != 'Y')
return 0;
return 1;
}
static void
ask_filename(struct passwd *pw, const char *prompt)
{
char buf[1024];
char *name = NULL;
if (key_type_name == NULL)
name = _PATH_SSH_CLIENT_ID_ED25519;
else {
switch (sshkey_type_from_name(key_type_name)) {
case KEY_DSA_CERT:
case KEY_DSA:
name = _PATH_SSH_CLIENT_ID_DSA;
break;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA_CERT:
case KEY_ECDSA:
name = _PATH_SSH_CLIENT_ID_ECDSA;
break;
case KEY_ECDSA_SK_CERT:
case KEY_ECDSA_SK:
name = _PATH_SSH_CLIENT_ID_ECDSA_SK;
break;
#endif
case KEY_RSA_CERT:
case KEY_RSA:
name = _PATH_SSH_CLIENT_ID_RSA;
break;
case KEY_ED25519:
case KEY_ED25519_CERT:
name = _PATH_SSH_CLIENT_ID_ED25519;
break;
case KEY_ED25519_SK:
case KEY_ED25519_SK_CERT:
name = _PATH_SSH_CLIENT_ID_ED25519_SK;
break;
case KEY_XMSS:
case KEY_XMSS_CERT:
name = _PATH_SSH_CLIENT_ID_XMSS;
break;
default:
fatal("bad key type");
}
}
snprintf(identity_file, sizeof(identity_file),
"%s/%s", pw->pw_dir, name);
printf("%s (%s): ", prompt, identity_file);
fflush(stdout);
if (fgets(buf, sizeof(buf), stdin) == NULL)
exit(1);
buf[strcspn(buf, "\n")] = '\0';
if (strcmp(buf, "") != 0)
strlcpy(identity_file, buf, sizeof(identity_file));
have_identity = 1;
}
static struct sshkey *
load_identity(const char *filename, char **commentp)
{
char *pass;
struct sshkey *prv;
int r;
if (commentp != NULL)
*commentp = NULL;
if ((r = sshkey_load_private(filename, "", &prv, commentp)) == 0)
return prv;
if (r != SSH_ERR_KEY_WRONG_PASSPHRASE)
fatal_r(r, "Load key \"%s\"", filename);
if (identity_passphrase)
pass = xstrdup(identity_passphrase);
else
pass = read_passphrase("Enter passphrase: ", RP_ALLOW_STDIN);
r = sshkey_load_private(filename, pass, &prv, commentp);
freezero(pass, strlen(pass));
if (r != 0)
fatal_r(r, "Load key \"%s\"", filename);
return prv;
}
#define SSH_COM_PUBLIC_BEGIN "---- BEGIN SSH2 PUBLIC KEY ----"
#define SSH_COM_PUBLIC_END "---- END SSH2 PUBLIC KEY ----"
#define SSH_COM_PRIVATE_BEGIN "---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----"
#define SSH_COM_PRIVATE_KEY_MAGIC 0x3f6ff9eb
#ifdef WITH_OPENSSL
static void
do_convert_to_ssh2(struct passwd *pw, struct sshkey *k)
{
struct sshbuf *b;
char comment[61], *b64;
int r;
if ((b = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((r = sshkey_putb(k, b)) != 0)
fatal_fr(r, "put key");
if ((b64 = sshbuf_dtob64_string(b, 1)) == NULL)
fatal_f("sshbuf_dtob64_string failed");
/* Comment + surrounds must fit into 72 chars (RFC 4716 sec 3.3) */
snprintf(comment, sizeof(comment),
"%u-bit %s, converted by %s@%s from OpenSSH",
sshkey_size(k), sshkey_type(k),
pw->pw_name, hostname);
sshkey_free(k);
sshbuf_free(b);
fprintf(stdout, "%s\n", SSH_COM_PUBLIC_BEGIN);
fprintf(stdout, "Comment: \"%s\"\n%s", comment, b64);
fprintf(stdout, "%s\n", SSH_COM_PUBLIC_END);
free(b64);
exit(0);
}
static void
do_convert_to_pkcs8(struct sshkey *k)
{
switch (sshkey_type_plain(k->type)) {
case KEY_RSA:
if (!PEM_write_RSA_PUBKEY(stdout, k->rsa))
fatal("PEM_write_RSA_PUBKEY failed");
break;
case KEY_DSA:
if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
fatal("PEM_write_DSA_PUBKEY failed");
break;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
fatal("PEM_write_EC_PUBKEY failed");
break;
#endif
default:
fatal_f("unsupported key type %s", sshkey_type(k));
}
exit(0);
}
static void
do_convert_to_pem(struct sshkey *k)
{
switch (sshkey_type_plain(k->type)) {
case KEY_RSA:
if (!PEM_write_RSAPublicKey(stdout, k->rsa))
fatal("PEM_write_RSAPublicKey failed");
break;
case KEY_DSA:
if (!PEM_write_DSA_PUBKEY(stdout, k->dsa))
fatal("PEM_write_DSA_PUBKEY failed");
break;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
if (!PEM_write_EC_PUBKEY(stdout, k->ecdsa))
fatal("PEM_write_EC_PUBKEY failed");
break;
#endif
default:
fatal_f("unsupported key type %s", sshkey_type(k));
}
exit(0);
}
static void
do_convert_to(struct passwd *pw)
{
struct sshkey *k;
struct stat st;
int r;
if (!have_identity)
ask_filename(pw, "Enter file in which the key is");
if (stat(identity_file, &st) == -1)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
if ((r = sshkey_load_public(identity_file, &k, NULL)) != 0)
k = load_identity(identity_file, NULL);
switch (convert_format) {
case FMT_RFC4716:
do_convert_to_ssh2(pw, k);
break;
case FMT_PKCS8:
do_convert_to_pkcs8(k);
break;
case FMT_PEM:
do_convert_to_pem(k);
break;
default:
fatal_f("unknown key format %d", convert_format);
}
exit(0);
}
/*
* This is almost exactly the bignum1 encoding, but with 32 bit for length
* instead of 16.
*/
static void
buffer_get_bignum_bits(struct sshbuf *b, BIGNUM *value)
{
u_int bytes, bignum_bits;
int r;
if ((r = sshbuf_get_u32(b, &bignum_bits)) != 0)
fatal_fr(r, "parse");
bytes = (bignum_bits + 7) / 8;
if (sshbuf_len(b) < bytes)
fatal_f("input buffer too small: need %d have %zu",
bytes, sshbuf_len(b));
if (BN_bin2bn(sshbuf_ptr(b), bytes, value) == NULL)
fatal_f("BN_bin2bn failed");
if ((r = sshbuf_consume(b, bytes)) != 0)
fatal_fr(r, "consume");
}
static struct sshkey *
do_convert_private_ssh2(struct sshbuf *b)
{
struct sshkey *key = NULL;
char *type, *cipher;
const char *alg = NULL;
u_char e1, e2, e3, *sig = NULL, data[] = "abcde12345";
int r, rlen, ktype;
u_int magic, i1, i2, i3, i4;
size_t slen;
u_long e;
BIGNUM *dsa_p = NULL, *dsa_q = NULL, *dsa_g = NULL;
BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL;
if ((r = sshbuf_get_u32(b, &magic)) != 0)
fatal_fr(r, "parse magic");
if (magic != SSH_COM_PRIVATE_KEY_MAGIC) {
error("bad magic 0x%x != 0x%x", magic,
SSH_COM_PRIVATE_KEY_MAGIC);
return NULL;
}
if ((r = sshbuf_get_u32(b, &i1)) != 0 ||
(r = sshbuf_get_cstring(b, &type, NULL)) != 0 ||
(r = sshbuf_get_cstring(b, &cipher, NULL)) != 0 ||
(r = sshbuf_get_u32(b, &i2)) != 0 ||
(r = sshbuf_get_u32(b, &i3)) != 0 ||
(r = sshbuf_get_u32(b, &i4)) != 0)
fatal_fr(r, "parse");
debug("ignore (%d %d %d %d)", i1, i2, i3, i4);
if (strcmp(cipher, "none") != 0) {
error("unsupported cipher %s", cipher);
free(cipher);
free(type);
return NULL;
}
free(cipher);
if (strstr(type, "dsa")) {
ktype = KEY_DSA;
} else if (strstr(type, "rsa")) {
ktype = KEY_RSA;
} else {
free(type);
return NULL;
}
if ((key = sshkey_new(ktype)) == NULL)
fatal("sshkey_new failed");
free(type);
switch (key->type) {
case KEY_DSA:
if ((dsa_p = BN_new()) == NULL ||
(dsa_q = BN_new()) == NULL ||
(dsa_g = BN_new()) == NULL ||
(dsa_pub_key = BN_new()) == NULL ||
(dsa_priv_key = BN_new()) == NULL)
fatal_f("BN_new");
buffer_get_bignum_bits(b, dsa_p);
buffer_get_bignum_bits(b, dsa_g);
buffer_get_bignum_bits(b, dsa_q);
buffer_get_bignum_bits(b, dsa_pub_key);
buffer_get_bignum_bits(b, dsa_priv_key);
if (!DSA_set0_pqg(key->dsa, dsa_p, dsa_q, dsa_g))
fatal_f("DSA_set0_pqg failed");
dsa_p = dsa_q = dsa_g = NULL; /* transferred */
if (!DSA_set0_key(key->dsa, dsa_pub_key, dsa_priv_key))
fatal_f("DSA_set0_key failed");
dsa_pub_key = dsa_priv_key = NULL; /* transferred */
break;
case KEY_RSA:
if ((r = sshbuf_get_u8(b, &e1)) != 0 ||
(e1 < 30 && (r = sshbuf_get_u8(b, &e2)) != 0) ||
(e1 < 30 && (r = sshbuf_get_u8(b, &e3)) != 0))
fatal_fr(r, "parse RSA");
e = e1;
debug("e %lx", e);
if (e < 30) {
e <<= 8;
e += e2;
debug("e %lx", e);
e <<= 8;
e += e3;
debug("e %lx", e);
}
if ((rsa_e = BN_new()) == NULL)
fatal_f("BN_new");
if (!BN_set_word(rsa_e, e)) {
BN_clear_free(rsa_e);
sshkey_free(key);
return NULL;
}
if ((rsa_n = BN_new()) == NULL ||
(rsa_d = BN_new()) == NULL ||
(rsa_p = BN_new()) == NULL ||
(rsa_q = BN_new()) == NULL ||
(rsa_iqmp = BN_new()) == NULL)
fatal_f("BN_new");
buffer_get_bignum_bits(b, rsa_d);
buffer_get_bignum_bits(b, rsa_n);
buffer_get_bignum_bits(b, rsa_iqmp);
buffer_get_bignum_bits(b, rsa_q);
buffer_get_bignum_bits(b, rsa_p);
if (!RSA_set0_key(key->rsa, rsa_n, rsa_e, rsa_d))
fatal_f("RSA_set0_key failed");
rsa_n = rsa_e = rsa_d = NULL; /* transferred */
if (!RSA_set0_factors(key->rsa, rsa_p, rsa_q))
fatal_f("RSA_set0_factors failed");
rsa_p = rsa_q = NULL; /* transferred */
if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0)
fatal_fr(r, "generate RSA parameters");
BN_clear_free(rsa_iqmp);
alg = "rsa-sha2-256";
break;
}
rlen = sshbuf_len(b);
if (rlen != 0)
error_f("remaining bytes in key blob %d", rlen);
/* try the key */
if ((r = sshkey_sign(key, &sig, &slen, data, sizeof(data),
alg, NULL, NULL, 0)) != 0)
error_fr(r, "signing with converted key failed");
else if ((r = sshkey_verify(key, sig, slen, data, sizeof(data),
alg, 0, NULL)) != 0)
error_fr(r, "verification with converted key failed");
if (r != 0) {
sshkey_free(key);
free(sig);
return NULL;
}
free(sig);
return key;
}
static int
get_line(FILE *fp, char *line, size_t len)
{
int c;
size_t pos = 0;
line[0] = '\0';
while ((c = fgetc(fp)) != EOF) {
if (pos >= len - 1)
fatal("input line too long.");
switch (c) {
case '\r':
c = fgetc(fp);
if (c != EOF && c != '\n' && ungetc(c, fp) == EOF)
fatal("unget: %s", strerror(errno));
return pos;
case '\n':
return pos;
}
line[pos++] = c;
line[pos] = '\0';
}
/* We reached EOF */
return -1;
}
static void
do_convert_from_ssh2(struct passwd *pw, struct sshkey **k, int *private)
{
int r, blen, escaped = 0;
u_int len;
char line[1024];
struct sshbuf *buf;
char encoded[8096];
FILE *fp;
if ((buf = sshbuf_new()) == NULL)
fatal("sshbuf_new failed");
if ((fp = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
encoded[0] = '\0';
while ((blen = get_line(fp, line, sizeof(line))) != -1) {
if (blen > 0 && line[blen - 1] == '\\')
escaped++;
if (strncmp(line, "----", 4) == 0 ||
strstr(line, ": ") != NULL) {
if (strstr(line, SSH_COM_PRIVATE_BEGIN) != NULL)
*private = 1;
if (strstr(line, " END ") != NULL) {
break;
}
/* fprintf(stderr, "ignore: %s", line); */
continue;
}
if (escaped) {
escaped--;
/* fprintf(stderr, "escaped: %s", line); */
continue;
}
strlcat(encoded, line, sizeof(encoded));
}
len = strlen(encoded);
if (((len % 4) == 3) &&
(encoded[len-1] == '=') &&
(encoded[len-2] == '=') &&
(encoded[len-3] == '='))
encoded[len-3] = '\0';
if ((r = sshbuf_b64tod(buf, encoded)) != 0)
fatal_fr(r, "base64 decode");
if (*private) {
if ((*k = do_convert_private_ssh2(buf)) == NULL)
fatal_f("private key conversion failed");
} else if ((r = sshkey_fromb(buf, k)) != 0)
fatal_fr(r, "parse key");
sshbuf_free(buf);
fclose(fp);
}
static void
do_convert_from_pkcs8(struct sshkey **k, int *private)
{
EVP_PKEY *pubkey;
FILE *fp;
if ((fp = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
if ((pubkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL)) == NULL) {
fatal_f("%s is not a recognised public key format",
identity_file);
}
fclose(fp);
switch (EVP_PKEY_base_id(pubkey)) {
case EVP_PKEY_RSA:
if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
fatal("sshkey_new failed");
(*k)->type = KEY_RSA;
(*k)->rsa = EVP_PKEY_get1_RSA(pubkey);
break;
case EVP_PKEY_DSA:
if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
fatal("sshkey_new failed");
(*k)->type = KEY_DSA;
(*k)->dsa = EVP_PKEY_get1_DSA(pubkey);
break;
#ifdef OPENSSL_HAS_ECC
case EVP_PKEY_EC:
if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
fatal("sshkey_new failed");
(*k)->type = KEY_ECDSA;
(*k)->ecdsa = EVP_PKEY_get1_EC_KEY(pubkey);
(*k)->ecdsa_nid = sshkey_ecdsa_key_to_nid((*k)->ecdsa);
break;
#endif
default:
fatal_f("unsupported pubkey type %d",
EVP_PKEY_base_id(pubkey));
}
EVP_PKEY_free(pubkey);
return;
}
static void
do_convert_from_pem(struct sshkey **k, int *private)
{
FILE *fp;
RSA *rsa;
if ((fp = fopen(identity_file, "r")) == NULL)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
if ((rsa = PEM_read_RSAPublicKey(fp, NULL, NULL, NULL)) != NULL) {
if ((*k = sshkey_new(KEY_UNSPEC)) == NULL)
fatal("sshkey_new failed");
(*k)->type = KEY_RSA;
(*k)->rsa = rsa;
fclose(fp);
return;
}
fatal_f("unrecognised raw private key format");
}
static void
do_convert_from(struct passwd *pw)
{
struct sshkey *k = NULL;
int r, private = 0, ok = 0;
struct stat st;
if (!have_identity)
ask_filename(pw, "Enter file in which the key is");
if (stat(identity_file, &st) == -1)
fatal("%s: %s: %s", __progname, identity_file, strerror(errno));
switch (convert_format) {
case FMT_RFC4716:
do_convert_from_ssh2(pw, &k, &private);
break;
case FMT_PKCS8:
do_convert_from_pkcs8(&k, &private);
break;
case FMT_PEM:
do_convert_from_pem(&k, &private);
break;
default:
fatal_f("unknown key format %d", convert_format);
}
if (!private) {
if ((r = sshkey_write(k, stdout)) == 0)
ok = 1;
if (ok)
fprintf(stdout, "\n");
} else {
switch (k->type) {
case KEY_DSA:
ok = PEM_write_DSAPrivateKey(stdout, k->dsa, NULL,
NULL, 0, NULL, NULL);
break;
#ifdef OPENSSL_HAS_ECC
case KEY_ECDSA:
ok = PEM_write_ECPrivateKey(stdout, k->ecdsa, NULL,
NULL, 0, NULL, NULL);
break;
#endif
case KEY_RSA:
ok = PEM_write_RSAPrivateKey(stdout, k->rsa, NULL,
NULL, 0, NULL, NULL);
break;
default:
fatal_f("unsupported key type %s", sshkey_type(k));
}
}
if (!ok)
fatal("key write failed");
sshkey_free(k);
exit(0);
}
#endif
static void
do_print_public(struct passwd *pw)
{
struct sshkey *prv;
struct stat st;
int r;
char *comment = NULL;
if (!have_identity)
ask_filename(pw, "Enter file in which the key is");
if (stat(identity_file, &st) == -1)
fatal("%s: %s", identity_file, strerror(errno));
prv = load_identity(identity_file, &comment);
if ((r = sshkey_write(prv, stdout)) != 0)
fatal_fr(r, "write key");
if (comment != NULL && *comment != '\0')
fprintf(stdout, " %s", comment);
fprintf(stdout, "\n");
if (sshkey_is_sk(prv)) {
debug("sk_application: \"%s\", sk_flags 0x%02x",
prv->sk_application, prv->sk_flags);
}
sshkey_free(prv);
free(comment);
exit(0);
}
static void
do_download(struct passwd *pw)
{
#ifdef ENABLE_PKCS11
struct sshkey **keys = NULL;
int i, nkeys;
enum sshkey_fp_rep rep;
int fptype;
char *fp, *ra, **comments = NULL;
fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
pkcs11_init(1);
nkeys = pkcs11_add_provider(pkcs11provider, NULL, &keys, &comments);
if (nkeys <= 0)
fatal("cannot read public key from pkcs11");
for (i = 0; i < nkeys; i++) {
if (print_fingerprint) {
fp = sshkey_fingerprint(keys[i], fptype, rep);
ra = sshkey_fingerprint(keys[i], fingerprint_hash,
SSH_FP_RANDOMART);
if (fp == NULL || ra == NULL)
fatal_f("sshkey_fingerprint fail");
printf("%u %s %s (PKCS11 key)\n", sshkey_size(keys[i]),
fp, sshkey_type(keys[i]));
if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
printf("%s\n", ra);
free(ra);
free(fp);
} else {
(void) sshkey_write(keys[i], stdout); /* XXX check */
fprintf(stdout, "%s%s\n",
*(comments[i]) == '\0' ? "" : " ", comments[i]);
}
free(comments[i]);
sshkey_free(keys[i]);
}
free(comments);
free(keys);
pkcs11_terminate();
exit(0);
#else
fatal("no pkcs11 support");
#endif /* ENABLE_PKCS11 */
}
static struct sshkey *
try_read_key(char **cpp)
{
struct sshkey *ret;
int r;
if ((ret = sshkey_new(KEY_UNSPEC)) == NULL)
fatal("sshkey_new failed");
if ((r = sshkey_read(ret, cpp)) == 0)
return ret;
/* Not a key */
sshkey_free(ret);
return NULL;
}
static void
fingerprint_one_key(const struct sshkey *public, const char *comment)
{
char *fp = NULL, *ra = NULL;
enum sshkey_fp_rep rep;
int fptype;
fptype = print_bubblebabble ? SSH_DIGEST_SHA1 : fingerprint_hash;
rep = print_bubblebabble ? SSH_FP_BUBBLEBABBLE : SSH_FP_DEFAULT;
fp = sshkey_fingerprint(public, fptype, rep);
ra = sshkey_fingerprint(public, fingerprint_hash, SSH_FP_RANDOMART);
if (fp == NULL || ra == NULL)
fatal_f("sshkey_fingerprint failed");
mprintf("%u %s %s (%s)\n", sshkey_size(public), fp,
comment ? comment : "no comment", sshkey_type(public));
if (log_level_get() >= SYSLOG_LEVEL_VERBOSE)
printf("%s\n", ra);
free(ra);
free(fp);
}
static void
fingerprint_private(const char *path)
{
struct stat st;
char *comment = NULL;
struct sshkey *privkey = NULL, *pubkey = NULL;
int r;
if (stat(identity_file, &st) == -1)
fatal("%s: %s", path, strerror(errno));
if ((r = sshkey_load_public(path, &pubkey, &comment)) != 0)
debug_r(r, "load public \"%s\"", path);
if (pubkey == NULL || comment == NULL || *comment == '\0') {
free(comment);
if ((r = sshkey_load_private(path, NULL,
&privkey, &comment)) != 0)
debug_r(r, "load private \"%s\"", path);
}
if (pubkey == NULL && privkey == NULL)
fatal("%s is not a key file.", path);
fingerprint_one_key(pubkey == NULL ? privkey : pubkey, comment);
sshkey_free(pubkey);
sshkey_free(privkey);
free(comment);
}
static void
do_fingerprint(struct passwd *pw)
{
FILE *f;
struct sshkey *public = NULL;
char *comment = NULL, *cp, *ep, *line = NULL;
size_t linesize = 0;
int i, invalid = 1;
const char *path;
u_long lnum = 0;
if (!have_identity)
ask_filename(pw, "Enter file in which the key is");
path = identity_file;
if (strcmp(identity_file, "-") == 0) {
f = stdin;
path = "(stdin)";
} else if ((f = fopen(path, "r")) == NULL)
fatal("%s: %s: %s", __progname, path, strerror(errno));
while (getline(&line, &linesize, f) != -1) {
lnum++;
cp = line;
cp[strcspn(cp, "\n")] = '\0';
/* Trim leading space and comments */
cp = line + strspn(line, " \t");
if (*cp == '#' || *cp == '\0')
continue;
/*
* Input may be plain keys, private keys, authorized_keys
* or known_hosts.
*/
/*
* Try private keys first. Assume a key is private if
* "SSH PRIVATE KEY" appears on the first line and we're
* not reading from stdin (XXX support private keys on stdin).
*/
if (lnum == 1 && strcmp(identity_file, "-") != 0 &&
strstr(cp, "PRIVATE KEY") != NULL) {
free(line);
fclose(f);
fingerprint_private(path);
exit(0);
}
/*
* If it's not a private key, then this must be prepared to
* accept a public key prefixed with a hostname or options.
* Try a bare key first, otherwise skip the leading stuff.
*/
comment = NULL;
if ((public = try_read_key(&cp)) == NULL) {
i = strtol(cp, &ep, 10);
if (i == 0 || ep == NULL ||
(*ep != ' ' && *ep != '\t')) {